2-Cyano-5-nitro-3-(trifluoromethoxy)-6-(trifluoromethyl)pyridine
5-Cyano-2-nitro-4-(trifluoromethoxy)-3-(trifluoromethyl)pyridine
5-Cyano-2-nitro-3-(trifluoromethoxy)-6-(trifluoromethyl)pyridine
4-Cyano-5-nitro-2-(trifluoromethoxy)-3-(trifluoromethyl)pyridine